xenharmonic (microtonal wiki)

Omnitetrachordal MOS scale
7L+5s
12 tones (5+2+5)

MOS of the meantone and flattone temperaments (slightly flat 3/2). Imperfect, but very usable at any L/s ratio. Many modes may be pentachordally split in two ways.

P = 0.7936402416
Q = 6.0713810872 (4/3 = 3L+1.5s)

L = 100.00 to 171.43 cents (153.38 cents @ Q)
s = 0.00 to 100.00 cents (25.26 cents @ Q)

9/8 = L+s (171.43 to 200.00 cents)
4/3 = 3L+2s (500.00 to 514.29 cents)
generator = 4/3

notable EDOs: 19, 26, 31, 33, 43, 45, 50, etc.

all modes:

	`sLLsL sL sLLsL`
	`LLsLs Ls LLsLs`
`Ls LsLsL LsLsL`	`LsLsL sL LsLsL`
`sL sLsLL sLsLL`
`Ls LsLLs LsLLs`		`LsLsL LsLsL Ls`
`sL sLLsL sLLsL`		`sLsLL sLsLL sL`
`Ls LLsLs LLsLs`		`LsLLs LsLLs Ls`
`sL LsLsL LsLsL`		`sLLsL sLLsL sL`
		`LLsLs LLsLs Ls`
	`LsLsL Ls LsLsL`	`LsLsL LsLsL sL`
	`sLsLL sL sLsLL`
	`LsLLs Ls LsLLs`